Improvement in machines for cutting wood for paper-pulp



. T. N. EGEBY.

Machines for Cutting Wood for Paper-Pulp. N0 155,074, Patented Sept.l5,1874.

UNITED STATES PATENT OFFICE.

THOMAS N. EGERY, OF BANGOR, MAINE.

IMPROVEMENT IN MACHINES FOR CUTTING WOOD FOR PAPER-PULP.

Specification forming part of Letters Patent N0. 155,074, datedSeptember 15, 1874 application filed February 12, 1872.

To all whom it may concern:

Be it known that I, THOMAS N. EGERY, of Bangor, in the county of Penobscot and State of Maine, have invented a new and useful Machine for the Manufacture of Wood- Pulp; and I hereby declare the following to be a full, clear, and exact description of the same, which will enable others to make and use my invention, reference being had to the accompanying drawing, in which Figure 1 shows a plan of my machine; Fig. 2, a side view.

-Reference to the drawing will explain my invention. It consists of a cylinder or cutter-head, to, having two-or more knives, b b I), set in its circumference, either parallel to its axis, (which arrangement I am inclined to think preferable,) or crossing the surface of the cylinder diagonally. (See detail A.) These knives are somewhat inclined toward the surface of the cylinder, as shown in the drawing, and are secured in place by any of the ordinary devices. At 0 is a shaft having bearings d d, and a band-wheel, e, by which it and the cylinder or cutter head a attached to it is revolved. At f is a table having feed-rolls g g, for presenting the log to the cutter-head, which feed -rolls are arranged and operated in the ordinary manner.

The upper or feeding surfaces of these rolls are level with the lowest part of the cutter-head, so' that the knives continue to operate upon the wood from the time they strike it until they reach their lowest point of revolution. Thus their cut is made as nearly as possible with the grain of the wood.

Previous to placing the log upon this table it is sawed or split into halves, enabling any decayed Wood and outside bark to be removed instead of being ground in with the pulp. It is then placed upon the rolls 9 g, with the flat side down, presenting an even surface for the rolls to act upon, and thus insuring regularity in their operation. As the cylinder and cutters revolve shavings from the log are removed of a thickness depending upon the speed with which the log is fed by the rolls g g, which may be regulated as desired in the usual manner.

It will be readily seen that my device is capable of reducing logs of any size to pulp without changing the machinery, which has not been done by any machine in which cutters have been used hitherto.

From the position of the knives upon the outside of the cylinder-head they can be easily removed and sharpened, and are less liable to clog with fiber.

Splitting the log enables crooked sticks to be cut as readily as straight ones, the feedworks operate with greater certainty, and the decayed wood so commonly found in the heart of poplar can be removed.

In order to keep the log down upon the rolls 9 g a presser roll or rolls, h, may be applied. I do not claim this, nor the rolls g by themselves, as they embody only the common feed mechanism used in saw-mills.

I also contemplate reversing, the direction of the knives b, as shown by the dotted knife b, and the revolution of the cutter-head, so as to cut the log from bottom to top, if found desirable.

I do not claim, by themselves, either cutter-heads or feed-rolls but, by my peculiar arrangement or combination of these devices, they are adapted to the preparation of paper-pulp, possessing peculiar advantages over the old processes of grinding or scraping, and

leaving the fiber of the Wood in better condition.

WVhat I claim as my invention, and desire to secure by Letters Patent, is v In a wood-cutting machine for paper-pulp, the combination of the feed-rolls and cutterhead, arranged in such manner that the log is subjected to the action of the cutters from the time said cutters strike it until they reach their lowest point of revolution, as herein set forth and shown.

THOS. N. EGERY.

Witnesses:

WM. FRANKLIN SEAVEY, J. Y. RIOKER. 

